<?php

// +----------------------------------------------------------------------

// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]

// +----------------------------------------------------------------------

// | Copyright (c) 2006-2013 http://thinkphp.cn All rights reserved.

// +----------------------------------------------------------------------

// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )

// +----------------------------------------------------------------------

// | Author: liu21st <liu21st@gmail.com>

// +----------------------------------------------------------------------

namespace Think;

/**

 * 加密解密类

 */

class Crypt {



    private static $handler    =   '';



    public static function init($type=''){

        $type   =   $type?$type:C('DATA_CRYPT_TYPE');

        $class  =   strpos($type,'\\')? $type: 'Think\\Crypt\\Driver\\'. ucwords(strtolower($type));

        self::$handler  =    $class;

    }



    /**

     * 加密字符串

     * @param string $str 字符串

     * @param string $key 加密key

     * @param integer $expire 有效期（秒） 0 为永久有效

     * @return string

     */

    public static function encrypt($data,$key,$expire=0){

        if(empty(self::$handler)){

            self::init();

        }

        $class  =   self::$handler; 

        return $class::encrypt($data,$key,$expire);

    }



    /**

     * 解密字符串

     * @param string $str 字符串

     * @param string $key 加密key

     * @return string

     */

    public static function decrypt($data,$key){

        if(empty(self::$handler)){

            self::init();

        }

        $class  =   self::$handler;         

        return $class::decrypt($data,$key);

    }

}